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A317250 as a simple table

na(n)
15
27
311
413
517
631
743
847
953
1067
1173
1279
13101
14127
15137
16157
17179
18181
19193
20197
21211
22223
23307
24379
25409
26431
27433
28619

[5,7,11,13,17,31,43,47,53,67,73,79,101,127,137,
 157,179,181,193,197,211,223,307,379,409,431,433,
 619]